Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 12.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-9) LANDSAT-9 Lat/Lon    Distance(km)  Time Diff(sec)
 08/13/2023   07:33:59   (  70.48,  61.92) 08/13/2023   07:35:09  (  70.40,  63.06)   43.18                70
 08/13/2023   08:24:33   ( -69.97,-129.98) 08/13/2023   08:24:45  ( -69.95,-129.96)    1.88                12
 08/13/2023   09:15:17   (  69.85,  37.50) 08/13/2023   09:14:12  (  69.85,  37.55)    1.90                65
 08/15/2023   23:50:42   (  70.03, 178.39) 08/15/2023   23:51:45  (  70.00, 178.37)    3.36                63
 08/16/2023   00:41:24   ( -69.94, -14.16) 08/16/2023   00:41:14  ( -69.94, -14.08)    2.85                10
 08/16/2023   01:31:59   (  69.35, 154.01) 08/16/2023   01:30:49  (  69.40, 152.82)   47.13                70
 08/18/2023   16:07:32   (  69.96, -65.72) 08/18/2023   16:08:14  (  69.97, -65.80)    2.77                42
 08/18/2023   16:58:14   ( -69.87, 101.73) 08/18/2023   16:57:44  ( -69.85, 101.68)    2.76                30
 08/21/2023   07:33:54   ( -70.90,-118.73) 08/21/2023   07:35:01  ( -70.78,-116.36)   87.83                67
 08/21/2023   08:24:22   (  69.96,  50.07) 08/21/2023   08:24:41  (  69.96,  50.09)    0.77                19
 08/21/2023   09:15:04   ( -69.86,-142.47) 08/21/2023   09:14:11  ( -69.85,-142.43)    1.87                53
 08/23/2023   23:50:30   ( -70.11,  -1.69) 08/23/2023   23:51:41  ( -70.10,  -1.47)    8.34                71
 08/24/2023   00:41:12   (  69.90, 165.94) 08/24/2023   00:41:09  (  69.93, 165.94)    3.48                 3
 08/24/2023   01:31:53   ( -69.75, -26.52) 08/24/2023   01:30:40  ( -69.77, -26.65)    5.35                73